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Selenium in Urine (Mass Concentration)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of selenium, a mineral important for health, found in your urine over a 24-hour period.

Quick summary

["Helps assess selenium levels in your body through urine samples."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
50903-4
Short code
Selenium Ur-sCnc
Synonyms
Selenium Ur-sCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms of selenium deficiency (e.g., hair loss, muscle pain) or if you’re at risk due to certain medical conditions, medications, or dietary factors. It can also be part of broader evaluations for nutrient imbalances or metabolic disorders.

What to Expect Before the Test

No special preparation is needed. Collect your urine over a full 24-hour period, starting after you wake up and ending after you wake up the next day. Store the sample in a cool place or refrigerator until you deliver it to the lab.

What Happens During the Test

Your urine sample is analyzed in a lab to measure selenium concentration. The test doesn’t require blood draw or invasive procedures.

Possible Results and Next Steps

Results are compared to general reference ranges for selenium in urine. If levels are low, your provider may recommend dietary adjustments, supplements, or further testing. High levels could indicate kidney issues or other conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Urine Selenium

Frequently asked questions

What does selenium do in the body?
Selenium is an essential mineral that supports immune function, thyroid health, and antioxidant protection. Low levels may contribute to deficiencies, while very high levels can sometimes signal underlying health concerns like kidney problems.
Can diet affect urine selenium levels?
Yes, diet plays a key role. Foods rich in selenium (e.g., nuts, fish, whole grains) can influence urine levels. Certain medications or medical conditions may also impact absorption or excretion.
Is this test painful or uncomfortable?
No, this test involves collecting urine over 24 hours, which is a standard non-invasive procedure. You’ll need to follow instructions carefully to ensure accurate results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy